Kubuntu is a a user friendly operating system based on KDE, the K Desktop Environment. With a predictable 6 month release cycle and part of the Ubuntu project, Kubuntu is the GNU/Linux distribution for everyone.

The openSUSE project is a community program sponsored by Novell. Promoting the use of Linux everywhere, openSUSE.org provides free, easy access to the world's most usable Linux distribution, openSUSE. The openSUSE project gives Linux developers and enthusiasts everything they need to get started with Linux.

From the home page:
"Linux Mint's purpose is to produce an elegant, up to date and comfortable GNU/Linux desktop distribution."
Linux Mint is freely available, complete desktop oriented GNU/Linux distribution based on Ubuntu. It is compatible with Ubuntu software repositories with its own
... [More] additions and replacements. It has its own desktop design and UI improvements and its own GUI administration tools.
Linux Mint is known to be designed for ease of use and maximal out-of-the-box functionality for desktop user. After installation you have for example working support for common media including most used proprietary codecs (flash, DVD playback, divx and so on). [Less]

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Xubuntu uses the Xfce desktop environment, meaning that it will run fast while still delivering a user-friendly interface. Older computers feel lively again, while newer ones will run faster than ever before!

ALT Linux is a set of Linux distributions that are based on Sisyphus, an APT-enabled RPM package repository that aims to achieve feature completeness, usability, and security in a sensible and manageable mixture.

Linux From Scratch is an instruction manual detailing how you can bootstrap, build, configure and install your very own GNU/Linux system from the ground up. Each piece of the Linux puzzle is explained, with instructions on how to configure and compile everything from source.

PLD is a free, RPM-based Linux distribution, aimed at the more advanced users and administrators, who accept the tradeoffs of using a system, that might require manual tweaking in exchange for much flexibility. Simultaneous support for a wide variety of architectures and non-conservative approach to
... [More] RPM usage provides our users with a consistent environment on almost all available architectures. [Less]